Eros and Thanatos

Walt is back among the living thanks to Ellie and a massive dose of the Damocles agency's superdrug. Meanwhile, their client Ava Troy narrowly escapes an assassination attempt. But the man who threatened her is a lone wolf, so who is behind the previous attacks? Religious extremists? Or an even less savory group? What secrets is Miss Troy hiding? And can Ellie keep her existential doubts in check much longer?