Sadie, Outback Jack, Father Jonas, and Sister Agatha travel with the rest of the party to Kathmandu in Nepal. There they leave the rest of their friends behind and visit a local inn to talk to the locals. They learn that there is a monastery abandoned by the local monks because the mi-go have attacked and taken it over with a great metal ship.
They talk to an expedition of men from America, but are brushed off. Sadie tries to sweet-talk them, but they tie her up and cast a spell on her to learn who she is working for. She tells them they are with Armitage's investigation society. They leave her tied up and head out from the inn. The other party members rescue her.
They head with some sherpa guides to the monastery. Inside they find a great mi-go spaceship. As they enter the hall the ship attacks with ice mist and lighting weapons. Father Jonas blasts off the lightning gun of the ship with his lightning gun. Outback Jack tosses a stick of dynamite into the cockpit of the ship and kills the mi-go pilot. The monastery begins to fill with icy mist and they abandoned it.
Their guides lead them around the valley of the tcho tcho tribe on the way to shangri-la. They find a yeti's cave and the yeti attacks them. They managed to kill the beast without causing an avalanche in the narrow canyon. Sadie skins the yeti and wears it's hide to protect her from the elements. Sadie's undead form is beaten badly by the yeti. They spend the night in the yeti's cave.
Sadie is standing watch over the cave when she hears noise outside. She investigates along without rousing her friends and sees a tcho tcho chewing on the remains of the yeti. As she turns to return to the cave several tcho tcho drop down from above and tackle her and drag her off. When the party awakens the next morning, they find their two guides have been dragged off to the tcho tcho village as well.
At the village, they find the tcho tcho have tied up one of the sherpas and are cooking the other one. They free the sherpa guide who flees in terror and begin searching the huts one by one for sadie as the tribe begins to encircle them. The tribal elder offers sister agatha a severed arm which she accepts and pretends to eat. Once Outback Jack find sadie and frees her she charges out and kills several tcho tcho. Sister christie and the rest of the party draw their guns and shoot the rest of the tribe. They head towards the caverns where they believe shangri-la is located in the next valley over.
in the first series of caves they find giant stone statues of the Great Race of Yith and a portal that reads "beyond these gates lies the ancient enemy". They decide not to go that way. The second path leads to a great webbed bridge which they also decide to abandon before crossing. The last path leads to a dry series of caves.
In the catacombs they head towards a humid dry valley filled with vegetation. There they find a dinosaur which sister agatha kills with her shotgun. Father henry is attacked by a giant preying mantis, but cuts one of it's talons and it flees. they head to the far side of the valley and find it dead ends. Also they find they are stalked by a large creature moving beyond the treeline. They flee quickly back to the catacombs before finding out what the creature is.
They head another way and find a rope bridge crossing a great chasm. Across the bridge they see two expedition members standing watch as the rest of them are conducting some sort of ritual.
Outback jack tries to sneak across the bridge and fails to surprise the gunmen who shoot him dead on the bridge. One of the guards tries to retrieve jack's body and falls to his doom off the faulty bridge as well. Sadie Benz tries crossing the bridge to engage the last guard and falls through the bridge. She fails to grasp ahold of the crumbling planks but her coat catches hold for a moment, but then she slips out of the yeti skin and plummets to her doom in the raging river below.
Sister Christie and Father Henry take out the remaining guard and blow up the ritual members with dynamite. They resurrect Outback Jack and Toni Lauratzi joins them (he was coming to investigate when they were gone for many days). After resting a day they investigate the ruins of Shangri-la.
They find a stairway leading down and a passageway in the side of the cliff. They take the side passageway into the cliff and find a squat stone structure. Father Henry Jonas feels drawn to the stone building with no apparent doors. As they move away from the building the priest notices that he becomes weaker and weaker. Finally they decide to blow up the building to see what is inside tormenting their friend. A blast of dynamite reveals the great old one Ygolonac, a tall naked headless man with fanged mouths in the palms of his hands. Ygolonac drives sister christy mad and she flails around on the ground then transforms into a deep one and attacks the party. After a desperate battle Ygolonac and Sister Agatha are slain.
Next they head into the stairs and find a treasure vault containing the statue of cthulhu they seek along with a giant statue of the great old one Chaugnar Faugn, who resembled a great elephant man with tentacled ears. Approaching the statue cautiously, it comes to life and grabs Father Jonas. The fathers eyes go dead and he tells the party to abandon him to the creature as he throws the statue to Toni. Toni blasts Chaugnar and the father with a whole clip from his tommygun, kiling the priest but leaving the great old one unharmed. As he turns to flee Chaugnar grabbs toni.
Toni tosses the statue to Outback Jack who flees the temple ruins, leaving Toni a slave to Chaugnar Faugn's dark whims. As he passes back over the bridge he takes out one final expedition guard on the bridge and meets up with herbert west in the catacombs before returning to Kathmandu and the rest of the party. Madeline Rammstein dies from the wasting disease she got from the tcho tcho in Malta, but Herbert West reanimates her and she comes back to live successfully and is not undead.
In calcutta, they find the ship send by Dagon is gone. With sister agatha gone, they have no way to summon him again, so they begin their journey back to Arkham. Now there are only five party members remaining: Herbert West, Regina Cumberton, Outback Jack, Prof. Greyson, Madeline Rammstein. Connell was lost at sea long with the holy grail and excalibur off the shores of malta.
